CN108020864B - Vertical survey line system for offshore shallow seismic exploration and application - Google Patents
Vertical survey line system for offshore shallow seismic exploration and application Download PDFInfo
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- CN108020864B CN108020864B CN201711483748.1A CN201711483748A CN108020864B CN 108020864 B CN108020864 B CN 108020864B CN 201711483748 A CN201711483748 A CN 201711483748A CN 108020864 B CN108020864 B CN 108020864B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3817—Positioning of seismic devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3843—Deployment of seismic devices, e.g. of streamers
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Abstract
The invention belongs to the technical field of marine seismic exploration, and particularly relates to a vertical survey line system for offshore shallow seismic exploration and application thereof. Compared with the traditional observation mode of the horizontal line of the ocean surface, the vertical line system and the application provided by the invention can better realize the imaging of the abnormal body intersected with the horizontal plane at a large angle, and meanwhile, the line mainly extends in the depth direction, occupies only a small area in the horizontal direction, does not influence the operation of the marine ship, and is little in interference by the current ship; the air gun seismic source is composed of a plurality of air guns in different directions, and after the seismic source is excited, the seismic wave energy propagates in a plurality of directions, so that the geological information returned by the interfaces at the side and the lower side can be better obtained. On the basis, the vibration is excited by adopting a measuring cable in a wireless mode, so that the waterproofness of the system is effectively ensured, and meanwhile, the corrosion of seawater to the vibration source can be reduced to a greater extent.
Description
Technical Field
The invention belongs to the technical field of marine seismic exploration, and particularly relates to a vertical survey line system for offshore shallow seismic exploration and application thereof.
Background
Offshore is the region where human development takes advantage of ocean activity the earliest and most frequently. Currently, how to effectively protect, rationally utilize and develop the ocean is a hotspot for research in countries around the world. The method is a large ocean country, has rich ocean resources, and is beneficial to the rapid development of the economy of China by reasonably developing and utilizing the ocean resources. In recent years, with the improvement of ocean resource development level, the scale of ocean engineering construction in China is larger and the structure is more complex, the requirements for engineering construction are more stringent, especially for the construction projects of ports, coastal power plants, cross-sea bridge tunnels, offshore oil platform engineering and the like, the requirements for the relief form of a bedrock surface and special geological phenomena such as submerged reefs, weathered deep grooves, submarine faults, submarine landslides and the like are higher, and the requirements for the penetration depth of stratum are also higher and higher. The method can provide powerful early-stage investigation guarantee for offshore engineering construction (ports, coastal power plants, cross-sea bridge tunnel engineering and the like) by performing offshore seabed fault detection and seabed landslide detection. The geological parameters such as fault distribution condition, landslide range, slip plane depth and morphology in the detection area are ascertained in advance, support and guidance are provided, and the basis is improved for site selection of engineering construction, coping and disposal measures of engineering geological problems in the construction period.
The seismic wave exploration technical method is one of the most common methods in shallow geology and structure exploration in the sea area. In order to optimize the marine observation mode and to study the imaging characteristics of the submarine geology, it is necessary to adopt an effective marine seismic exploration device and method. The current detection device has the following problems.
(1) The arrangement range of the survey lines is large, and the shipping is influenced. Marine seismic exploration often adopts a multi-line observation mode, and under the observation mode, if the undersea geology is to be detected more accurately, a large-area arrangement line is required. The navigation is more in offshore locations, the arrangement of the large-scale survey lines influences the navigation, the collected data is also influenced by the navigation, and the detection accuracy is reduced. Meanwhile, the geological conditions at the offshore are complex, the change of the inclination angle of the interface is large, and if a small-range observation mode is adopted, the detailed detection of various geological interfaces is difficult to achieve. Therefore, it is highly desirable to provide an observation mode that has a small horizontal occupation range and can realize accurate detection of multiple inclination interfaces.
(2) The positions of the seismic source and the detector are not easy to fix. In a conventional survey line, a seismic source and a detector are often arranged respectively, and the observation mode can only achieve good setting on the ocean surface, but is affected by ocean currents and the like at a deep position (10-100 m), so that the mutual positions of the seismic source and the detector are difficult to fix by adopting a towing rope, and the coordinate measurement and calculation of the seismic source and the detector point are easy to cause great difficulty, so that the result interpretation is affected. Therefore, there is an urgent need to provide an apparatus and method for fixing a detector and a seismic source well and performing multi-point excitation.
(3) The wavefield acquired by the detectors is limited. Conventional ocean exploration only needs to collect data of geological information right below the survey line, so that the requirement can be met by adopting a single-component detector. However, when the detector is immersed in water, the acquired information not only contains the reflection information below, but also needs the seismic information transmitted laterally; meanwhile, as the vertical line in the sea is in a linear observation mode, the data of the single-component detector is adopted for processing, and mirror image false abnormality is often formed. Therefore, it is highly desirable to provide a three-component geophone acquisition device that can meet the vertical measurement to obtain more comprehensive wave field information and suppress false anomalies.
(4) Waterproof and control system. Because the survey line is arranged in deep water, high requirements are required for waterproof and anti-pressing of the instrument and the equipment, and the existing instrument and the equipment are difficult to meet the requirements. Therefore, it is highly desirable to provide a control method that has good waterproof and anti-pressing effects and can realize non-contact.
Disclosure of Invention
The invention aims to provide a vertical survey line system for offshore shallow seismic exploration, aiming at the defects in the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
a vertical line system of an offshore shallow seismic survey, the vertical line system of an offshore shallow seismic survey comprising: the system comprises a movable air gun focus device, a fixed three-component detector and a central control system, wherein the movable air gun focus device and the fixed three-component detector are arranged on a measurement cable along the vertical direction, and a focus shock control cable and a seismic wave information transmission cable are arranged in the measurement cable; the central control system is arranged on the hull of the exploration ship and is connected with the measuring cable; the movable air gun focus device slides up and down along the vertical direction on the measuring cable and comprises an air gun carrier, wherein a plurality of horizontal air guns, a plurality of vertical air guns and an air gun combination controller are arranged on the air gun carrier, the plurality of horizontal air guns are arranged on the side wall of the air gun carrier and uniformly divide the space around the air gun carrier, the plurality of vertical air guns are arranged at the lower part of the air gun carrier and uniformly divide the space at the lower part of the air gun carrier, and the air gun combination controller is used for controlling the horizontal air guns and the vertical air guns to perform various combined shock; the fixed three-component detectors are arranged on the measuring cable at intervals along the vertical direction, and comprise an X-component detector, a Y-component detector, a Z-component detector and a seismic source wireless transmitter; the central control system transmits control signals to the seismic source wireless transmitter through the seismic source excitation control cable arranged in the measuring cable, transmits the control signals to the movable air gun seismic source device through the seismic source wireless transmitter to perform seismic source excitation, and meanwhile, the fixed three-component detector performs data acquisition of seismic wave information and transmits the seismic wave information back to the central control system through the seismic wave information transmission cable.
The invention can also adopt or combine the following technical proposal when adopting the technical proposal:
preferably, a hanging ring is arranged above the movable air gun focus device, and the hanging ring is connected to a hanging rope coil arranged on the exploration ship body through a hanging rope.
Preferably, a small permanent magnet is arranged on the inner side of the movable air gun focus device; the electromagnetic control cable is connected with the central control system, the electromagnetic control cable is connected with the electromagnetic iron arranged in the fixed three-component detector and used for controlling the on-off of the electromagnetic iron, and the electromagnetic iron is matched with the small permanent magnet under the on-off condition to be used for fixing or loosening the movable air gun focus device.
Preferably, the tail of the measuring cable is sequentially provided with a supporting plate and an iron drop from top to bottom along the vertical direction, the supporting plate is used for limiting the movable air gun focus device to prevent the movable air gun focus device from falling, and the iron drop is used for providing a downward driving force for the vertical measuring line system.
Preferably, the vertical survey line system further comprises a fixing frame arranged on the hull of the exploration ship, and a measuring cable fixed pulley arranged on the fixing frame, wherein the measuring cable fixed pulley is used for penetrating through the measuring cable and sliding on the surface of the measuring cable.
Preferably, the vertical survey line system further comprises a fixed frame arranged on the hull of the exploration ship and a lifting rope fixed pulley arranged on the fixed frame, wherein the lifting rope fixed pulley is used for penetrating through the lifting rope and sliding on the surface of the lifting rope.
Preferably, the vertical measuring line system further comprises a measuring cable coil connected to the central control system and controlled to rotate by the central control system for winding and unwinding the measuring cable.
Preferably, the vertical measuring line system further comprises a lifting rope coil which is respectively connected to the central control system and controlled to rotate by the central control system for winding and unwinding the measuring lifting rope.
It is another object of the present invention to provide an application of a vertical survey line system for offshore shallow seismic exploration, which addresses the deficiencies of the prior art.
For this purpose, the above object of the present invention is achieved by the following technical solutions:
use of a vertical line system of an offshore shallow seismic survey, the use of the vertical line system of an offshore shallow seismic survey comprising: the vertical survey line system of the offshore shallow seismic survey described above is applied to offshore seismic surveys.
The invention can also adopt or combine the following technical proposal when adopting the technical proposal:
preferably, the application of the vertical line system for offshore shallow seismic exploration comprises:
(1) Investigation is carried out on the offshore engineering site, a proper detection place is selected according to the requirement, and the exploration ship is stopped;
(2) Mounting the movable air gun focus device on the tail part of the measuring cable and enabling the movable air gun focus device to lean against a supporting plate arranged below the movable air gun focus device;
(3) The electromagnet switch is turned on, so that the movable air gun focus device is adsorbed on the supporting plate and kept fixed;
(4) The central control system controls the measuring cable coil and the lifting rope coil to release the measuring cable and the lifting rope, the measuring cable is vertically placed into water through the fixed pulley, the release length of the measuring cable is calculated through the rotating speed sensor arranged on the measuring cable coil, and when the iron drop arranged below the supporting plate is placed at the deepest position where the measuring cable is placed, the release of the measuring cable and the lifting rope is stopped;
(5) Closing an electromagnet in the fixed three-component detector, rotating a lifting rope coil, lifting the lifting rope upwards by 1/2 minimum detector distance along the vertical direction, and then opening the electromagnet in the fixed three-component detector;
(6) Continuing to rotate the lifting rope coil, lifting the movable air gun focus device, and when the movable air gun focus device reaches the position above the movable air gun focus device closest to the position where the fixed three-component detector is located, immediately attracting the movable air gun focus device with an electromagnet in the fixed three-component detector and fixing the movable air gun focus device;
(7) The central control system outputs a command for exciting a seismic wave, and the command of the seismic wave is transmitted to the movable air gun seismic source device through a wireless transceiver arranged on the fixed three-component detector and is controlled to perform shock;
(8) When the movable air gun focus device is shocked, a shocked signal is returned to each fixed three-component detector, so that each fixed three-component detector starts to acquire data of seismic wave information and transmits the data back to the central control system through a seismic wave information transmission cable;
(9) Repeating the steps (5) to (8) after the vibration exciting and data collecting operation of the current position is completed until vibration exciting and data collecting of all vibration source points are completed;
(10) Recycling the instrument;
(11) And (3) data processing, namely calculating the distance between each fixed three-component detector and the mutual distance between different seismic source positions and each detector, and calculating the delay time of each acquired data by combining the wave velocity of seawater, so as to be introduced into the processing of the seismic data.
The beneficial effects of the invention are as follows:
(1) Compared with the traditional observation mode of the horizontal line of the ocean surface, the vertical line system and the observation mode of the offshore shallow seismic exploration provided by the invention can better realize the imaging of abnormal bodies crossing a horizontal plane at a large angle, especially at geological complex places such as off-shore gullies, land frames, submerged reefs and the like, can better realize the imaging of geological interfaces, and simultaneously, because the line of the vertical line system mainly extends in the depth direction, only occupies a very small area in the horizontal direction, does not influence the operation of the offshore ships and is also little interfered by the current ships.
(2) The invention provides a vertical survey line system for offshore shallow seismic exploration and application thereof, wherein an air gun source is composed of a plurality of air guns in different directions, and after the source is excited, seismic wave energy propagates in a plurality of directions, so that geological information returned by side and lower interfaces can be better obtained; meanwhile, the seismic source is sleeved on the measuring cable, so that the mutual positions of the seismic source and the measuring cable are ensured, and the precise positions of the seismic source and the detector can be obtained in the later period. On the basis, the vibration is excited by adopting a measuring cable in a wireless mode, so that the waterproofness of the system is effectively ensured, and meanwhile, the corrosion of seawater to the vibration source can be reduced to a greater extent.
(3) The invention provides a vertical survey line system for offshore shallow seismic exploration and application thereof.
(4) The vertical survey line system and the application of the offshore shallow seismic exploration provided by the invention can study the imaging characteristics and the optimized observation mode of offshore geologic bodies, can better guide the on-site exploration work, find out the fault distribution condition, landslide range, slip plane depth, morphology and other geologic parameters in a detection area in advance, provide support and guidance, and improve the basis for site selection of engineering construction and coping and disposing measures of engineering geologic problems in the construction period.
Drawings
FIG. 1 is a schematic diagram of a vertical survey line system for offshore shallow seismic exploration provided by the present invention;
FIG. 2a is a front view of a mobile air gun source device according to the present invention;
FIG. 2b is a top view of a mobile air gun source device according to the present invention;
FIG. 3a is a schematic diagram of a fixed three-component detector according to the present invention;
FIG. 3b is a cross-sectional view taken at A-A of FIG. 3 a;
in the figure: 100-exploration ship hulls; 101-fixing frames; 200-a mobile air gun seismic source device; 201-an air gun carrier; 202-horizontal air guns; 203-vertical air gun; 204-small permanent magnets; 205-air gun combination controller; 206-hanging rings; 300-stationary three-component detector; a 301-X-component detector; 302-Y-component detector; a 303-Z-component detector; 304-a source wireless transmitter; 305-an electromagnet; 401-measuring cable; 402-measuring a cable fixed pulley; 403-measuring the cable coil; 404-a seismic source shock control cable; 405-seismic wave information transmission cable; 406-an electromagnet control cable; 5-a central control system; 601-a lifting rope; 602-a lifting rope fixed pulley; 603-a sling coil; 7-supporting plates; 8-iron drop.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific embodiments.
Example 1
A vertical survey line system for offshore shallow seismic exploration, comprising: the mobile air gun focus device 200, the fixed three-component detector 300 and the central control system 5 are arranged on the measuring cable 401 along the vertical direction, and the focus excitation control cable 404 and the seismic wave information transmission cable 405 are arranged in the measuring cable 401; the central control system 5 is arranged on the exploration ship hull 100 and is connected with the measurement cable 401; the mobile air gun focus device 200 slides up and down along the vertical direction on the measurement cable 401, the mobile air gun focus device 200 comprises an air gun carrier 201, a plurality of horizontal air guns 202, a plurality of vertical air guns 203 and an air gun combination controller 205 are arranged on the air gun carrier 201, the plurality of horizontal air guns 202 are arranged on the side wall of the air gun carrier 201 and uniformly divide the space around the air gun carrier 201, the plurality of vertical air guns 203 are arranged at the lower part of the air gun carrier 201 and uniformly divide the space at the lower part of the air gun carrier 201, and the air gun combination controller 205 is used for controlling the horizontal air guns 202 and the vertical air guns 203 to perform various combined shock; the fixed three-component detectors 300 are arranged on the measuring cable 401 in a plurality and at intervals along the vertical direction, and the fixed three-component detectors 300 comprise an X-component detector 301, a Y-component detector 302, a Z-component detector 303 and a seismic source wireless transmitter 304; the central control system 5 transmits control signals to the source wireless transmitter 304 through the source excitation control cable 404 provided in the measurement cable 401 and transmits control signals to the mobile air gun source device 200 through the source wireless transmitter 304 for source excitation, while the stationary three-component geophone 300 performs data acquisition of seismic wave information and transmits back to the central control system 5 through the seismic wave information transmission cable 405.
A lifting ring 206 is arranged above the movable air gun seismic source 200 device, and the lifting ring 206 is connected to a lifting rope coil 603 arranged on the exploration ship body 100 through a lifting rope 601.
A small permanent magnet 204 is arranged on the inner side of the movable air gun focus device 200; an electromagnet 305 is arranged in the fixed three-component detector 300, an electromagnet control cable 406 is also arranged in the measurement cable 401, the electromagnet control cable 406 is connected with the central control system 5, the electromagnet control cable 406 is connected with the electromagnet 305 arranged in the fixed three-component detector 300 and used for controlling the on-off state of the electromagnet 305, and the electromagnet 305 is matched with the small permanent magnet 204 under the on-off state to fix or loosen the movable air gun focus device 200.
The tail of the measuring cable 404 is sequentially provided with a supporting plate 7 and an iron plummet 8 from top to bottom along the vertical direction, the supporting plate 7 is used for limiting the movable air gun vibration source device 200 to prevent the movable air gun vibration source device from falling, and the iron plummet 8 is used for providing a downward driving force for the vertical measuring line system.
The vertical survey line system further includes a mount 101 disposed on the survey vessel hull 100, a measurement cable fixed pulley 402 disposed on the mount 101, and a hoist rope fixed pulley 602, the measurement cable fixed pulley 402 being for passing through the measurement cable 401 and for sliding the measurement cable 401 on its surface, the hoist rope fixed pulley 602 being for passing through the hoist rope 601 and for sliding the hoist rope 601 on its surface.
The vertical measuring line system further comprises a measuring cable coil 403 and a lifting rope coil 603, the measuring cable coil 403 and the lifting rope coil 603 being connected to the central control system 5 and controlled by it to rotate for winding and unwinding the measuring cable 401 and the lifting rope 601, respectively.
Example 2
An application of a vertical survey line system for offshore shallow seismic exploration, comprising:
(1) Investigation is carried out on the offshore engineering site, a proper detection place is selected according to the requirement, and the exploration ship is stopped;
(2) Mounting the movable air gun focus device on the tail part of the measuring cable and enabling the movable air gun focus device to lean against a supporting plate arranged below the movable air gun focus device;
(3) The electromagnet switch is turned on, so that the movable air gun focus device is adsorbed on the supporting plate and kept fixed;
(4) The central control system controls the measuring cable coil and the lifting rope coil to release the measuring cable and the lifting rope, the measuring cable is vertically placed into water through the fixed pulley, the release length of the measuring cable is calculated through the rotating speed sensor arranged on the measuring cable coil, and when the iron drop arranged below the supporting plate is placed at the deepest position where the measuring cable is placed, the release of the measuring cable and the lifting rope is stopped;
(5) Closing an electromagnet in the fixed three-component detector, rotating a lifting rope coil, lifting the lifting rope upwards by 1/2 minimum detector distance along the vertical direction, and then opening the electromagnet in the fixed three-component detector;
(6) Continuing to rotate the lifting rope coil, lifting the movable air gun focus device, and when the movable air gun focus device reaches the position above the movable air gun focus device closest to the position where the fixed three-component detector is located, immediately attracting the movable air gun focus device with an electromagnet in the fixed three-component detector and fixing the movable air gun focus device;
(7) The central control system outputs a command for exciting a seismic wave, and the command of the seismic wave is transmitted to the movable air gun seismic source device through a wireless transceiver arranged on the fixed three-component detector and is controlled to perform shock;
(8) When the movable air gun focus device is shocked, a shocked signal is returned to each fixed three-component detector, so that each fixed three-component detector starts to acquire data of seismic wave information and transmits the data back to the central control system through a seismic wave information transmission cable;
(9) Repeating the steps (5) to (8) after the vibration exciting and data collecting operation of the current position is completed until vibration exciting and data collecting of all vibration source points are completed;
(10) Recycling the instrument;
(11) And (3) data processing, namely calculating the distance between each fixed three-component detector and the mutual distance between different seismic source positions and each detector, and calculating the delay time of each acquired data by combining the wave velocity of seawater, so as to be introduced into the processing of the seismic data.
The above detailed description is intended to illustrate the present invention by way of example only and not to limit the invention to the particular embodiments disclosed, but to limit the invention to the precise embodiments disclosed, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A vertical line system for offshore shallow seismic exploration, the vertical line system comprising: the system comprises a movable air gun focus device, a fixed three-component detector and a central control system, wherein the movable air gun focus device and the fixed three-component detector are arranged on a measurement cable along the vertical direction, and a focus shock control cable and a seismic wave information transmission cable are arranged in the measurement cable; the central control system is arranged on the hull of the exploration ship and is connected with the measuring cable; the movable air gun focus device slides up and down along the vertical direction on the measuring cable and comprises an air gun carrier, wherein a plurality of horizontal air guns, a plurality of vertical air guns and an air gun combination controller are arranged on the air gun carrier, the plurality of horizontal air guns are arranged on the side wall of the air gun carrier and uniformly divide the space around the air gun carrier, the plurality of vertical air guns are arranged at the lower part of the air gun carrier and uniformly divide the space at the lower part of the air gun carrier, and the air gun combination controller is used for controlling the horizontal air guns and the vertical air guns to perform various combined shock; the fixed three-component detectors are arranged on the measuring cable at intervals along the vertical direction, and comprise an X-component detector, a Y-component detector, a Z-component detector and a seismic source wireless transmitter; the central control system transmits control signals to the seismic source wireless transmitter through the seismic source excitation control cable arranged in the measuring cable, transmits the control signals to the movable air gun seismic source device through the seismic source wireless transmitter to perform seismic source excitation, and meanwhile, the fixed three-component detector performs data acquisition of seismic wave information and transmits the seismic wave information back to the central control system through the seismic wave information transmission cable.
2. The vertical survey line system of shallow sea seismic exploration according to claim 1, wherein a lifting ring is arranged above the mobile air gun seismic source device, and is connected to a lifting rope coil arranged on the hull of the exploration vessel through a lifting rope.
3. The vertical survey line system of marine shallow seismic exploration according to claim 1, wherein a small permanent magnet is arranged inside the mobile air gun seismic source device; the electromagnetic control cable is connected with the central control system, the electromagnetic control cable is connected with the electromagnetic iron arranged in the fixed three-component detector and used for controlling the on-off of the electromagnetic iron, and the electromagnetic iron is matched with the small permanent magnet under the on-off condition to be used for fixing or loosening the movable air gun focus device.
4. The vertical survey line system of shallow sea seismic exploration according to claim 1, wherein the tail of the survey cable is provided with a supporting plate and an iron weight in sequence from top to bottom along the vertical direction, the supporting plate is used for limiting the movable air gun seismic source device to prevent the falling of the movable air gun seismic source device, and the iron weight is used for providing downward driving force for the vertical survey line system.
5. The vertical survey line system of claim 1, further comprising a mount disposed on the hull of the survey vessel, a survey cable crown block disposed on the mount for passing through the survey cable and for sliding the survey cable over its surface.
6. The vertical survey line system of claim 1, further comprising a mount disposed on the hull of the survey vessel, a hoist rope fixed sheave disposed on the mount for passing through the hoist rope and for sliding the hoist rope over its surface.
7. The vertical survey line system of shallow sea seismic surveying according to claim 5 or 6, further comprising a survey cable coil connected to and controlled by a central control system for reeling and unreeling the survey cable.
8. A vertical survey line system for shallow sea seismic surveying according to claim 5 or 6 and also comprising hoist line coils connected to and controlled for rotation by a central control system for reeling and unreeling survey hoist lines, respectively.
9. The application of a vertical line system for offshore shallow seismic exploration, which is characterized by comprising: use of the vertical survey line system of the offshore shallow seismic survey of any one of claims 1-6 in a marine seismic survey.
10. The use of a vertical line system for offshore shallow seismic exploration according to claim 9, wherein said use of a vertical line system for offshore shallow seismic exploration comprises:
(1) Investigation is carried out on the offshore engineering site, a proper detection place is selected according to the requirement, and the exploration ship is stopped;
(2) Mounting the movable air gun focus device on the tail part of the measuring cable and enabling the movable air gun focus device to lean against a supporting plate arranged below the movable air gun focus device;
(3) The electromagnet switch is turned on, so that the movable air gun focus device is adsorbed on the supporting plate and kept fixed;
(4) The central control system controls the measuring cable coil and the lifting rope coil to release the measuring cable and the lifting rope, the measuring cable is vertically placed into water through the fixed pulley, the release length of the measuring cable is calculated through the rotating speed sensor arranged on the measuring cable coil, and when the iron drop arranged below the supporting plate is placed at the deepest position where the measuring cable is placed, the release of the measuring cable and the lifting rope is stopped;
(5) Closing an electromagnet in the fixed three-component detector, rotating a lifting rope coil, lifting the lifting rope upwards by 1/2 minimum detector distance along the vertical direction, and then opening the electromagnet in the fixed three-component detector;
(6) Continuing to rotate the lifting rope coil, lifting the movable air gun focus device, and when the movable air gun focus device reaches the position above the movable air gun focus device closest to the position where the fixed three-component detector is located, immediately attracting the movable air gun focus device with an electromagnet in the fixed three-component detector and fixing the movable air gun focus device;
(7) The central control system outputs a command for exciting a seismic wave, and the command of the seismic wave is transmitted to the movable air gun seismic source device through a wireless transceiver arranged on the fixed three-component detector and is controlled to perform shock;
(8) When the movable air gun focus device is shocked, a shocked signal is returned to each fixed three-component detector, so that each fixed three-component detector starts to acquire data of seismic wave information and transmits the data back to the central control system through a seismic wave information transmission cable;
(9) Repeating the steps (5) to (8) after the vibration exciting and data collecting operation of the current position is completed until vibration exciting and data collecting of all vibration source points are completed;
(10) Recycling the instrument;
(11) And (3) data processing, namely calculating the distance between each fixed three-component detector and the mutual distance between different seismic source positions and each detector, and calculating the delay time of each acquired data by combining the wave velocity of seawater, so as to be introduced into the processing of the seismic data.
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